DPD 1 Tablets test the pool water for free Chlorine levels. DPD 1 Tablets should be used with a test kit designed for their use. Pentair test kits commonly use this technology for testing as an alternative to chemical reagents for testing pool water for Chlorine.
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I’ve been out of this in my kit for a while. Good price and recommend!
These little tablets work great. They respond quickly.
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